Add make command update-translations for update translations from cro…

…dwin (go-gitea#2097)

* add make command update-translations for update translations from crowdin to options/locale

* use curl & resolve double quote on make file

Makefile

@@ -278,3 +278,13 @@ swagger-ui:
 
 .PHONY: assets
 assets: javascripts stylesheets
+
+.PHONY: update-translations
+update-translations:
+	mkdir -p ./translations
+	cd ./translations && curl -L https://crowdin.com/download/project/gitea.zip > gitea.zip && unzip gitea.zip
+	rm ./translations/gitea.zip
+	$(SED_INPLACE) -e 's/="/=/g' -e 's/"$$//g' ./translations/*.ini
+	$(SED_INPLACE) -e 's/\\"/"/g' ./translations/*.ini
+	mv ./translations/*.ini ./options/locale/
+	rmdir ./translations